I got an alternative gun and tried to disassemble and repair the sponge gun, which is old and bullets no longer fly, back to my son,
I bought an outer diameter of 20 mm wire diameter 1.6 mm free length 700 mm,
Just to exchange sand and dust inside the gun and exchange springs as it is in Maverick, although the strong arm requires machining of the pla shaft (degree to cut with a cutter), it is barely both spring length and strength and Japanese made NERF poor It became the flight distance as imported version, the son who exchanged the spring by himself seems to be the best favorite over the new gun, the old gun reinforced with his own effort.

Purchased to spare of HOP unit of Tokyo Marui L 96 AWS. Because it is hard to find skillfully searching for plural owner (multiple owner's omnibus) and after parts there is no spring only sales. Since it costs 1600 yen for set sale, we can maintain with this with confidence.